Nissan March K13. Instruction — part 285
EM-74
< REMOVAL AND INSTALLATION >
[HR12DE]
CYLINDER HEAD
2.
Tighten cylinder head bolts in numerical order as shown in the
figure with the following procedure to install cylinder head.
CAUTION:
If cylinder head bolts are reused, check their outer diame-
ters before installation. Refer to “Cylinder Head Bolts Outer
Diameter”.
a.
Apply new engine oil to threads and seating surfaces of mount-
ing bolts.
b.
Tighten all bolts.
c.
Turn all bolts 60 degrees clockwise (angle tightening).
CAUTION:
Check and confirm the tightening angle by using the angle
wrench [SST: KV10112100] (A) or protractor. Avoid judg-
ment by visual inspection without the tool.
d.
Completely loosen.
CAUTION:
In this step, loosen bolts in reverse order of that indicated in the figure.
e.
Tighten all bolts.
f.
Turn all bolts 75 degrees clockwise (angle tightening).
g.
Turn all bolts 75 degrees clockwise again (angle tightening).
3.
Install in the reverse order of removal after this step.
Disassembly and Assembly
INFOID:0000000005988203
DISASSEMBLY
1.
Remove spark plug with a spark plug wrench (commercial service tool).
2.
Remove valve lifter.
• Identify installation positions, and store them without mixing them up.
3.
Remove valve collet.
A
: EXH side
B
: INT side
: Engine front
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
JPBIA3428ZZ
JPBIA3401ZZ
: 0 N·m (0 kg-m, 0 ft-lb)
: 40.0 N·m (4.1 kg-m, 30 ft-lb)
CYLINDER HEAD
EM-75
< REMOVAL AND INSTALLATION >
[HR12DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Compress valve spring with the valve spring compressor, the
attachment and the adapter [SST: KV10116200] (A). Remove
valve collet with a magnet hand (B).
CAUTION:
When working, be careful not to damage valve lifter holes.
4.
Remove valve spring retainer and valve spring.
5.
Push valve stem to combustion chamber side, and remove valve.
• Identify installation positions, and store them without mixing them up.
6.
Remove valve oil seal with the valve oil seal puller [SST:
KV10107902] (A).
7.
Remove valve spring seat.
8.
When valve seat must be replaced, refer to
to removal.
9.
When valve guide must be replaced, refer to
to removal.
ASSEMBLY
1.
Install valve guide if removed. Refer to
2.
Install valve seat if removed. Refer to
.
3.
Install valve oil seal.
• Install with the valve oil seal drift [SST: KV10115600] (A) to
match dimension in the figure.
4.
Install valve spring seat.
5.
Install valve.
• Install larger diameter to intake side.
6.
Install valve spring.
NOTE:
It can be installed in either direction.
7.
Install valve spring retainer.
8.
Install valve collet.
JPBIA3402ZZ
JPBIA3403ZZ
Height “H”
: 13.2 - 13.8 mm (0.519 - 0.543 in)
JPBIA3404ZZ
EM-76
< REMOVAL AND INSTALLATION >
[HR12DE]
CYLINDER HEAD
• Compress valve spring with the valve spring compressor, the
attachment and the adapter [SST: KV10116200] (A). Install
valve collet with a magnet hand (B).
CAUTION:
When working, be careful not to damage valve lifter holes.
• Tap valve stem edge lightly with a plastic hammer after instal-
lation to check its installed condition.
9.
Install valve lifter.
10. Install spark plug with a spark plug wrench (commercial service tool).
Inspection
INFOID:0000000005988204
INSPECTION AFTER REMOVAL
Cylinder Head Bolts Outer Diameter
• Cylinder head bolts are tightened by plastic zone tightening
method. Whenever the size difference between “d1” and “d2”
exceeds the limit, replace them with a new one.
• If reduction of outer diameter appears in a position other than “d2”,
use it as “d2” point.
Cylinder Head Distortion
NOTE:
When performing this inspection, cylinder block distortion should be also checking. Refer to
.
1.
Wipe off engine oil and remove water scale (like deposit), gasket, sealant, carbon, etc. with a scraper.
CAUTION:
Use utmost care not to allow gasket debris to enter passages for engine oil or engine coolant.
2.
At each of several locations on bottom surface of cylinder head,
measure the distortion in six directions.
• If it exceeds the limit, replace cylinder head.
INSPECTION AFTER DISASSEMBLY
VALVE DIMENSIONS
• Check the dimensions of each valve. For the dimensions, refer to
.
• If dimensions are out of the standard, replace valve and check valve seat contact. Refer to “VALVE SEAT
CONTACT”.
VALVE GUIDE CLEARANCE
Valve Stem Diameter
PBIC3727E
Limit (“d1”–“d2”): 0.15 mm (0.0059 in)
PBIC3717E
A
: Straightedge
B
: Feeler gauge
Limit
: Refer to
PBIC3207J
CYLINDER HEAD
EM-77
< REMOVAL AND INSTALLATION >
[HR12DE]
C
D
E
F
G
H
I
J
K
L
M
A
EM
N
P
O
• Measure the diameter of valve stem with micrometer (A).
Valve Guide Inner Diameter
• Measure the inner diameter of valve guide with bore gauge.
Valve Guide Clearance
• (Valve guide clearance) = (Valve guide inner diameter) – (Valve
stem diameter)
• If the calculated value exceeds the limit, replace valve and/or valve guide. When valve guide must be
replaced. Refer to
EM-74, "Disassembly and Assembly"
.
VALVE SEAT CONTACT
• After confirming that the dimensions of valve guides and valves are within the specifications, perform this
procedure.
• Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve
contact on the surface.
• Check if the contact area band is continuous all around the circum-
ference.
• If not, grind to adjust valve fitting and check again. If the contacting
surface still has “NG” conditions (B) even after the recheck,
replace valve seat. Refer to
EM-74, "Disassembly and Assembly"
.
VALVE SPRING SQUARENESS
• Set a try square (A) along the side of valve spring and rotate
spring. Measure the maximum clearance between the top of spring
and try square.
• If it exceeds the limit, replace valve spring.
VALVE SPRING DIMENSIONS AND VALVE SPRING PRESSURE LOAD
• Check valve spring pressure with valve spring seat installed at the
specified spring height.
CAUTION:
Never remove valve spring seat from valve spring.
• If the installation load or load with valve open is out of the stan-
dard, replace valve spring (with valve spring seat).
INSPECTION AFTER INSTALLATION
Standard
: Refer to
.
Standard
: Refer to
.
Standard and Limit
: Refer to
.
PBIC3213J
A
: OK
JPBIA0187ZZ
B
: Contact
Limit
: Refer to
.
PBIC3219J
Standard
: Refer to
.
SEM113
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